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Drop Py37, improve typing and docstrings (#544)
Drops Py3.7, improves typing and adds a mypy config, improves the docstrings and isorts the imports. * configure isort * sort with isort * add github action * enable flake8-docstrings * fix docstrings * add mypy env * no implicit optional * add type for raw * add some type hints
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@@ -1,9 +1,11 @@
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"""Print example QR codes."""
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import sys
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from escpos.printer import Usb
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def usage():
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"""Print information on usage."""
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print("usage: qr_code.py <content>")
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